Nortek RSA1BD4M Series User manual

SPLIT SYSTEM AIR CONDITIONER
*SA(1,2)BD4M1 SERIES - (S,R)N18K, (S,R)N24K, (S,R)N30K, (S,R)N36K, SN42K, SN48K, &
SN60K (1.5, 2, 2.5, 3, 3.5, 4, & 5 TON) - SINGLE PHASE MODELS
13 SEER
INSTALLATION INSTRUCTIONS
IMPORTANT
ATTENTION INSTALLERS:
It is your responsibility to know this product better than your customer.This includes being able to install the product
according to strict safety guidelines and instructing the customer on how to operate and maintain the equipment for
the life of the product. Safety should always be the deciding factor when installing this product and using common
sense plays an important role as well. Pay attention to all safety warnings and any other special notes highlighted in
the manual. Improper installation of the unit or failure to follow safety warnings could result in serious injury, death,
or property damage.
These instructions are primarily intended to assist qualified individuals experienced in the proper installation of this
appliance. Some local codes require licensed installation/service personnel for this type of equipment. Please read all
instructions carefully before starting the installation. Return these instructions to the customer’s package for future
reference.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
IMPORTANT SAFETY INFORMATION.................. 2
AIR CONDITIONER INSTALLATION.....................3
General Information ...............................................3
Before You Install this Unit.....................................3
Locating the Air Conditioner...................................3
Packaging Removal ...............................................3
Ground Level .........................................................3
Roof Mount ............................................................3
Connecting Refrigerant Tubing Between the
Indoor & Outdoor Unit ............................................4
ELECTRICAL WIRING ...........................................4
Pre-Electrical Checklist ..........................................4
Line Voltage ...........................................................4
Grounding ..............................................................5
Comfort AlertTM Diagnostics Module ......................5
(Select Models Only)..............................................5
24 VAC Power Wiring .......................................... 5
Thermostat Demand Wiring.................................5
Interpreting the Diagnostic LED’s ........................5
LED Description...................................................5
Thermostat Connections........................................ 6
AIR CONDITIONER MAINTENANCE..................... 6
Panel Removal.......................................................6
Panel Installation.................................................... 6
START UP & ADJUSTMENTS ............................... 7
Pre-Start Check List............................................... 7
Start-Up Procedures ..............................................7
Air Circulation - Indoor Blower ............................. 7
System Cooling.................................................... 7
System Heating (optional) ................................... 7
REFRIGERANT CHARGING ..................................7
Charging the Unit in AC mode ............................... 8
If the outdoor temperature is 65 degrees F
or higher:..............................................................8
If the outdoor temperature is below 65
degrees F:............................................................8
ELECTRICAL DIAGRAMS & TABLES ..................9
Figure 5. Wiring Diagram for *SA(1,2)BD4M
(1.5, 2, 2.5, 3, 3.5, 4, & 5 Ton Units) .... 9
Figure 6. Wiring Diagram for *SA(1,2)BD4M1RN
(1.5, 2, 2.5, & 3 Ton Units)....................10
Table 1. Comfort Alert LED Diagnostics .............. 11
Table 2. Module Wiring Troubleshooting ............. 12
INSTALLATION CHECKLIST................................. 16
REPLACEMENT PARTS ........................................16

2
WARNING:
The information listed below must be followed
during the installation, service, and operation
of this unit. Unqualified individuals should
not attempt to interpret these instructions or
install this equipment. Failure to follow safety
recommendations could result in possible
damage to the equipment, serious personal
injury or death.
• The installer must comply with all local codes and
regulations which govern the installation of this type of
equipment. Local codes and regulations take precedence
over any recommendations contained in these instructions.
Consult local building codes and the National Electrical
Code (ANSI CI) for special installation requirements.
• All electrical wiring must be completed in accordance with
local, state and national codes and regulations and with
the National Electric Code (ANSI/NFPA 70) or in Canada
the Canadian Electric Code Part 1 CSA C.22.1.
• This equipment contains liquid and gaseous refrigerant
under high pressure. DO NOT USE ANY PORTION OF THE
CHARGE FOR PURGING OR LEAK TESTING.Installation
or servicing should only be performed by qualified trained
personnel thoroughly familiar with this type equipment.
• Fully annealed, refrigerant grade copper tubing should be
used when installing the system. Refrigerant suction line
tubing should be fully insulated.
• Installation of equipment may require brazing operations.
Installer must comply with safety codes and wear
appropriate safety equipment (safety glasses, work gloves,
fire extinguisher, etc.) when performing brazing operations.
• Follow all precautions in the literature, on tags, and on
labels provided with the equipment. Read and thoroughly
understand the instructions provided with the equipment
prior to performing the installation and operational checkout
of the equipment.
• Refrigerant and electrical line should be routed through
suitably waterproofed openings to prevent water from
leaking into the structure.
• This unit is designed for outdoor installations only and
should be positioned as shown on page 3.
IMPORTANT SAFETY INFORMATION
INSTALLER: Please read all instructions before servicing
this equipment. Pay attention to all safety warnings and any
other special notes highlighted in the manual. Safety markings
are used frequently throughout this manual to designate a
degree or level of seriousness and should not be ignored.
WARNING indicates a potentially hazardous situation that if
not avoided, could result in personal injury or death.
CAUTION indicates a potentially hazardous situation that
if not avoided, may result in minor or moderate injury or
property damage.
WARNING:
Shut off all electrical power to the unit before
performing any maintenance or service on the
system. Failure to comply may result in personal
injury or death.
WARNING:
Unless noted otherwise in these instructions,
only factory authorized parts or accessory
kits may be used with this product. Improper
installation, service, adjustment, or maintenance
may cause explosion, fire, electrical shock or
other hazardous conditions which may result in
personal injury or property damage
WARNING:
*SA(1,2)BD4M Split System Air Conditioners
are shipped charged with R410A refrigerant
and ready for installation. If repairs make it
necessary for evacuation and charging, it should
only be attempted by qualified trained personnel
thoroughly familiar with this equipment. Under
no circumstances should the owner attempt to
install and/or service this equipment. Failure to
comply with this warning could result in property
damage, personal injury, or death.
CAUTION:
This unit uses refrigerant R-410A. DO NOT use
any other refrigerant in this unit. Use of another
refrigerant will damage the unit.

3
AIR CONDITIONER INSTALLATION
General Information
The *SA(1,2)BD4M series air conditioner is designed only
for outdoor rooftop or ground level installations. This unit
has been tested for capacity and efficiency in accordance
with AHRI Standards and will provide many years of safe
and dependable comfort, providing it is properly installed
and maintained. Abuse, improper use, and/or improper
maintenance can shorten the life of the appliance and create
unsafe hazards.
To achieve optimum performance and minimize equipment
failure, it is recommended that periodic maintenance be
performed on this unit. The ability to properly perform
maintenance on this equipment requires certain mechanical
skills and tools.
Before You Install this Unit
√The cooling load of the area to be conditioned must be
calculated and a system of the proper capacity selected.
It is recommended that the area to be conditioned be
completely insulated and vapor sealed.
√Check the electrical supply and verify the power supply
is adequate for unit operation. The system must be wired
and provided with circuit protection in accordance with
local building codes. If there is any question concerning
the power supply, contact the local power company.
√The indoor section (air handler, furnace, etc) should be
installed before routing the refrigerant tubing. Refer to the
indoor unit's installation instructions for installation details.
√All units are securely packed at the time of shipment and
upon arrival should be carefully inspected for damage prior
to installing the equipment at the job site. Verify coil fins
are straight. If necessary, comb fins to remove flattened
or bent fins. Claims for damage (apparent or concealed)
should be filed immediately with the carrier.
√Please consult your dealer for maintenance information
and availability of maintenance contracts. Please read all
instructions before installing the unit.
Locating the Air Conditioner
• Survey the job site to determine the best location for
mounting the outdoor unit.
• The outdoor unit should be installed no closer than 18
inches from the outside walls of the facility and in an area
free from overhead obstructions to ensure unrestricted
airflow through the outdoor unit.
• Sufficient clearance for unobstructed airflow through the
outdoor coil must be maintained in order to achieve rated
performance. See Figure 1 for minimum clearances to
obstructions.
• Overhead obstructions (Figure 1), poorly ventilated areas,
and areas subject to accumulation of debris should be
avoided.
• Consideration should be given to availability of electric
power, service access, noise, and shade.
Packaging Removal
NOTE: To prevent damage to the tubing connections, carefully
remove the carton and user’s manual from the equipment.
Discard the shipping carton.
Ground Level
Ground level installations must be located according to local
building codes or ordinances and these requirements:
• Clearances must be in accordance with those shown in
Figure 1.
• A suitable mounting pad (Figure 1) must be provided and
separate from the building foundation. The pad must be
level and strong enough to support the weight of the unit.
The slab height must be a minimum of 2” (5 cm) above
grade and with adequate drainage.
Roof Mount
• The method of mounting should be designed so that it does
not overload roof structures or transmit noise to the interior
of the structure. The roof must be structurally capable of
handling the weight of the unit.
• Full perimeter support is required under the unit. Support
must be made of weather resistant materials and installed
prior to unit installation.
• The support must be built to raise the unit 6" above the
roof.
2” Mounting Pad
24" for
Service Access
12" or 18”
See Note
12" or 18”
See Note
DO NOT
OBSTRUCT
TOP OF UNIT
NOTE: Units require full perimeter clearances.
Installer must maintain 18” between two units
or 12” between single unit and structure.
6” from Building
or Structure
48”
Figure 1. Clearance Requirements

4
Connecting Refrigerant Tubing Between the Indoor
& Outdoor Unit
CAUTION:
When servicing, cover or seal openings to
minimize the exposure of the refrigerant system
to air to prevent accumulation of moisture and
other contaminants.
After outdoor and indoor unit placement has been determined,
route refrigerant tubing between the equipment in accordance
with sound installation practices.
• When connecting refrigerant linesets together, it is
recommended that dry nitrogen be flowing through the
joints during brazing to prevent internal oxidation and
scaling.
• Refrigerant tubing should be routed in a manner that
minimizes the length of tubing and the number of bends
in the tubing. If precise forming of refrigerant lines is
required, a copper tubing bender is recommended. Avoid
sharp bends and contact of the refrigerant lines with metal
surfaces.
• Refrigerant tubing should be supported in a manner that the
tubing will not vibrate or abrade during system operation.
• Tubing should be kept clean of foreign debris during
installation.
• Every effort should be made by the installer to ensure that
the field installed refrigerant containing components of
the system have been installed in accordance with these
instructions and sound installation practices to insure
reliable system operation and longevity.
• The maximum recommended interconnecting refrigerant
line lengths is 75 ft. and the vertical elevation difference
between the indoor and outdoor sections should not exceed
20 ft.
• A filter dryer is provided with the unit and must be installed
in the liquid line of the system. If the installation replaces a
system with a filter dryer already present in the liquid line,
the filter dryer must be replaced with the one supplied with
the unit. The filter dryer must be installed in strict accordance
with the manufacturer’s installation instructions.
• Optional equipment such as liquid line solenoid valves,
low ambient, etc., should be installed in strict accordance
with the manufacturer’s installation instructions.
ELECTRICAL WIRING
WARNING:
To avoid risk of electrical shock, personal
injury, or death, disconnect all electrical power
to the unit before performing any maintenance
or service. The unit may have more than one
electrical supply.
Label all wires prior to disconnection when
servicing the unit. Wiring errors can cause
improper and dangerous operation.
• All electrical connections must be in compliance with
all applicable local codes and ordinances, and with
the current revision of the National Electric Code
(ANSI/NFPA 70).
• For Canadian installations the electrical connections and
grounding shall comply with the current Canadian Electrical
Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist
√Verify that the voltage, frequency, and phase of the supply
source match the specifications on the unit rating plate.
√Verify that the service provided by the utility is sufficient
to handle the additional load imposed by this equipment.
Refer to the unit wiring label for proper voltage wiring.
√Verify factory wiring is in accordance with the unit wiring
diagrams Figure 5 (page) 9) and Figure 6 (page) 10.
Inspect for loose connections.
Line Voltage
• A wiring diagram is located on the inside cover of the
electrical box of the outdoor unit. The installer should
become familiar with the wiring diagram before making
any electrical connections to the outdoor unit.
• An electrical disconnect must be located within sight of and
readily accessible to the unit. This switch shall be capable
of electrically de-energizing the outdoor unit.
• Line voltage to the unit should be supplied from a dedicated
branch circuit containing the correct fuse or circuit breaker
for the unit. Incoming field wiring and minimum size of
electrical conductors and circuit protection must be in
compliance with information listed on the outdoor unit
data label. Any other wiring methods must be acceptable
to authority having jurisdiction.
• The outdoor unit requires both power and control circuit
electrical connections. Refer to the wiring diagram for
identification and location of outdoor unit field wiring
interfaces Figure 5 (page) 9) and Figure 6 (page)
10. Make all electrical connections in accordance with
all applicable codes and ordinances.
• Overcurrent protection must be provided at the branch
circuit distribution panel and sized as shown on the unit
rating label and according to applicable local codes. See
the unit rating plate for minimum circuit ampacity and
maximum overcurrent protection limits.
• Provide power supply for the unit in accordance with the
unit wiring diagram, and the unit rating plate. Connect the
line-voltage leads to the terminals on the contactor inside
the control compartment.
• Use only copper wire for the line voltage power supply to
this unit in strict accordance of the NEC (ANSI/NFPA 70),
applicable local codes, and the instructions provided with

5
the equipment. Use proper code agency listed conduit and
a conduit connector for connecting the supply wires to the
unit. Use of rain tight conduit is recommended.
• 208/230 Volt units are shipped from the factory wired for
230 volt operation. For 208V operation, remove the lead
from the transformer terminal marked 240V and connect
it to the terminal marked 208V.
• Optional equipment requiring connection to the power or
control circuits must be wired in strict accordance of the
NEC (ANSI/NFPA 70), applicable local codes, and the
instructions provided with the equipment.
Grounding
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. Do not
use gas piping as an electrical ground!
This unit must be electrically grounded in accordance with
local codes or, in the absence of local codes, with the National
Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical
Code. Use the grounding lug provided in the control box for
grounding the unit.
Comfort AlertTM Diagnostics Module
(Select Models Only)
The Comfort AlertTM Diagnostics Module (Figure 2) is a
breakthrough innovation that troubleshoots heat pump and
air conditioning system failures and accurately detects the
cause of electrical and system related failures without any
sensors. The module installs easily in the electrical box of the
outdoor unit near the compressor contactor. By monitoring
and analyzing data from the Copeland scroll compressor and
the thermostat demand, the module can accurately detect
the cause of electrical and system related failures without
any sensors. A flashing LED indicator communicates the
ALERT code and a diagnostic key is also imprinted on the
side of the module to quickly direct the technician to the root
cause of a problem.
Figure 2. Comfort AlertTM Diagnostics Module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key
NOTE: This module does not provide safety protection! The
Comfort AlertTM Diagnostics Module is a monitoring device
and cannot control or shut down other devices.
24 VAC Power Wiring
The Comfort AlertTM module requires a constant nominal
24 VAC power supply. The module cannot be powered by
the Cterminal on a defrost board or other control board
without experiencing nuisance alerts. NOTE: The wiring to
the module’s R& Cterminals must be routed directly from
the indoor unit or thermostat.
If the constant 24 VAC (Rwire) is not present in the outdoor
unit, use one of the spare wires in the thermostat cable to
bring power to the module. Connect the other end of the
spare wire to Rat the indoor unit or thermostat.
Thermostat Demand Wiring
The Comfort AlertTM module requires a thermostat demand
signal to operate properly. The thermostat demand signal
input (labeled Yon the module), should always be connected
to the compressor contactor coil. NOTE: When the coil is
energized, the demand signal input is 24 VAC. When the
coil is not energized, the demand signal input should be less
than 0.5 VAC.
NOTES:
• Factory installed modules have different thermostat demand
signal wiring. Always follow manufacturer wiring instructions
when replacing the module.
• After the thermostat demand signal is connected, verify
that 24 VAC across Y & C when demand is present.
Interpreting the Diagnostic LED’s
When an abnormal system condition occurs, the Comfort
AlertTM module displays the appropriate ALERT and/or TRIP
LED will flash a number of times consecutively, pause and
then repeat the process. To identify a Flash Code number,
count the number of consecutive flashes.
Each time the module powers up, the last ALERT Flash Code
that occurred prior to shut down is displayed for one minute.
The module will continue to display the LED until the condition
returns to normal or if 24 VAC power is removed from the
module. See Table 1 (page 11) for flash code identification
or Table 2 (page 12) for module wiring troubleshooting.
LED Description
• POWER LED (Green): indicates voltage is present at the
power connection of the module.
• ALERT LED (Yellow): communicates an abnormal
system condition through a unique flash code.
NOTE: The ALERT LED will flash consecutively, pause
and then repeat the process. The number of consecutive
flashes, referred to as the Flash Code, correlates to a
particular abnormal condition. Detailed descriptions of
these ALERT Flash Codes are listed in Table 1 (page
11) and Table 2 (page 12).
• TRIP LED (Red): indicates a demand signal is received
from the thermostat, but current to the compressor is not
detected by the module. The TRIP LED typically indicates
if the compressor protector is open or the compressor has
no power.
The scroll compressor’s R (run), C(common), and S(start)
wires are routed through the holes in the Comfort AlertTM
module marked R, C, & S.NOTE: The common wire does
not need to be routed through the module for it to operate.

6
Thermostat Connections
• Thermostat connections should be made in accordance
with the instructions supplied with the thermostat and the
indoor equipment.
• The outdoor unit is designed to operate from a 24 VAC
Class II control circuit. The control circuit wiring must comply
with the current provisions of the NEC (ANSI/NFPA 70)
and with applicable local codes having jurisdiction.
• The low voltage wires must be properly connected to the
units low voltage terminal block.
• The thermostat should be mounted about 5 feet above the
floor on an inside wall. DO NOT install the thermostat on
an outside wall or any other location where its operation
may be adversely affected by radiant heat from fireplaces,
sunlight, or lighting fixtures, and convective heat from
warm air registers or electrical appliances. Refer to the
thermostat manufacturer’s instruction sheet for detailed
mounting and installation information.
AIR CONDITIONER MAINTENANCE
WARNING:
To prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical
supply.
Proper maintenance is important to achieve optimum
performance from the air conditioner. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following:
• Inspect and clean or replace air filters at the beginning of
each heating and cooling season, or more frequently if
required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using a
mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season. Service
as necessary.
CAUTION:
The unit should never be operated without a
filter in the return air system. Replace disposable
filters with the same type and size.
• Do not attempt to add additional oil to motors unequipped
with oil tubes. The compressor is hermetically sealed at
the factory and does not require lubrication.
• To access the internal components of the unit, refer to
Figure 3 (page) 6for panel removal and Figure 4 (page)
6for panel installation.
Panel Removal
1. Remove screws securing the panel.
2. Slide the panel up towards the top pan in order to clear
the bottom flange from the base pan. See Figure 3.
3. Swing the bottom of the panel out and pull the panel down
to remove it from the unit.
Panel Installation
1. Insert the top corners of side panel flanges into the corner
post channels as shown in Detail A in Figure 4.
2. Slide the panel up into the top pan. (You may need to push
on the center of the panel at the top in order to clear the
top pan edge).
3. Swing the panel in and push down until the panel is resting
on the top edge of the base pan wall as shown in Detail
B.
4. Install screws into the panel to secure it to the unit.
Figure 3. Panel Removal
DETAIL A
DETAIL B
Figure 4. Panel Installation

7
REFRIGERANT CHARGING
WARNING:
*SA(1,2)BD4M Split System Air Conditioners
are shipped charged with R410A refrigerant
and ready for installation. If repairs make it
necessary for evacuation and charging, it should
only be attempted by qualified trained personnel
thoroughly familiar with this equipment. Under
no circumstances should the owner attempt to
install and/or service this equipment. Failure to
comply with this warning could result in property
damage, personal injury, or death.
After refrigerant line connections are completed, it is required
that you leak check and evacuate the indoor section and all
line connections (using proper methods) before finalizing the
full system refrigerant charge.
• *SA(1,2)BD4M outdoor units with non-AHRI listed indoor
coils are not recommended. Deviations from rated airflows
or non-listed combinations may require modification to the
expansion device and refrigerant charging procedures for
proper and efficient system operation.
• The refrigerant charge can be checked and adjusted through
the service ports provided external to the outdoor unit. Use
only gage line sets which have a “Schrader” depression
device present to actuate the valve.
• A high-pressure switch is factory-installed and located in
the liquid line internal to the outdoor unit. The switch is
designed to protect the system when very high pressures
occur during abnormal conditions. Under normal conditions,
the switch is closed. If the liquid pressure rises above 575
psig, then the switch will open and de-energize the outdoor
unit. The switch will close again once the liquid pressure
decreases to 460 psig. Please note that the switch interrupts
the thermostat inputs to the unit. Thus, when the switch
opens and then closes, there may be a 5 minute short
cycling delay before the outdoor unit will energize.
• A low-pressure switch (Select Models) is factory-installed
and located in the suction line internal to the outdoor unit.
The switch is designed to protect the compressor from
a loss of charge. Under normal conditions, the switch is
closed. If the suction pressure falls below 5 psig, then the
switch will open and de-energize the outdoor unit. The
switch will close again once the suction pressure increases
above 20 psig. Please note that the switch interrupts the
thermostat inputs to the unit. When the switch opens and
then closes, there will be a 5 minute short cycling delay
before the outdoor unit will energize.
START UP & ADJUSTMENTS
Pre-Start Check List
√Verify the indoor unit is level and allows proper condensate
drainage.
√Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/control
panels are in place.
√Verify air filters are cleaned and properly installed.
√Verify duct work is sealed to prevent air leakage.
√Verify line voltage power leads are securely connected
and the unit is properly grounded.
√Verify low voltage wires are securely connected to the
correct leads on the low voltage terminal strip.
√Verify power supply branch circuit overcurrent protection
is sized properly.
√Verify the thermostat is wired correctly.
Start-Up Procedures
The thermostat's function mode should be set to OFF and
the fan mode should be set to AUTO. Close all electrical
disconnects to energize the system.
Air Circulation - Indoor Blower
1. Set the thermostat system mode on OFF and the fan mode
to ON.
2. Verify the blower runs continuously. Check the air delivery
at the supply registers and adjust register openings for
balanced air distribution. If insufficient air is detected,
examine ductwork for leaks or obstructions.
3. Set the thermostat fan mode to AUTO and verify the blower
stops running.
System Cooling
1. Set the thermostat’s system mode to COOL and the fan
mode to AUTO. Gradually lower the thermostat temperature
setpoint below room temperature and verify the outdoor
unit and indoor blower energize.
2. Verify blower wheel is spinning in direction indicated by
arrow. Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature. Listen
for any unusual noises. If unusual sounds occur, determine
the source of the noise and correct as necessary.
3. Verify HI and LO refrigerant pressures.
4. Allow the system to operate for several minutes and then
set the temperature selector above room temperature.
Verify the fan and compressor cycle off with the thermostat.
NOTE: The blower should also stop unless fan mode is
set to the ON position.
System Heating (optional)
1. Set the thermostat's system mode to HEAT and the
temperature mode above room temperature.
2. Verify the optional heating equipment (furnace or electric
heat) and indoor blower energize. Feel the air being
circulated by the indoor blower and verify that it is warmer
than ambient temperature. Listen for any unusual noises.
If unusual sounds occur, determine the source of the noise
and correct as necessary.

8
Charging the Unit in AC mode
If the outdoor temperature is 65 degrees F or higher:
After completing the refrigerant line connections, leak checking the system, and evacuating the indoor section and all line
connections (using proper methods), perform the following steps:
1. Determine the recommended charge addition (if applicable) for the system being installed. This information is in the
unit’s QRD (Quick Reference Data sheet).
2. Calculate the amount of additional refrigerant needed for the line set length of the actual installation. This information is
on the first page of the unit’s QRD (Quick Reference Data sheet).
3. Weigh in the additional charge amounts determined by step 1 and 2 above.
4. Adjust the charge to match the superheat (for fixed orifice systems) or subcooling (for TXV systems). There are three
different resources for doing this:
a.) The chargecalculator.com website. This will walk you through the charging process step by step.
b.) The charging tables on the inside of the outdoor unit’s electrical box cover panel. These tables provide superheat
targets for fixed orifice systems and subcooling targets for TXV systems. The system should be charged so that
the measured superheat/subcooling are within 1 degree F of the target listed in the table.
For fixed orifice systems:
• If your measured superheat at the suction valve is LESS THAN the recommended superheat value in the
table then REMOVE refrigerant.
• If your measured superheat at the suction valve is GREATER THAN the recommended superheat value
in the table then ADD refrigerant.
For TXV systems:
• If your measured subcooling at the liquid valve is LESS THAN the recommended subcooling value in the
table then ADD refrigerant.
• If your measured subcooling at the liquid valve is GREATER THAN the recommended subcooling value
in the table then REMOVE refrigerant.
c.) The charging tables in the Supplemental Charging Information, can be found online in the literature library. The
tables can also be accessed by scanning the QR code on the unit’s electrical panel. The pressures listed in these
tables are for reference only and are to be used in troubleshooting a system. The system should be charged to
match the superheat or subcooling targets as previously noted and not to match the system pressures.
Follow the same procedure described in 4b above.
If the outdoor temperature is below 65 degrees F:
After completing the refrigerant line connections, leak checking the system, and evacuating the indoor section and all line
connections (using proper methods), perform the following steps:
1. Determine the recommended charge addition (if applicable) for the system being installed. This information is in the
unit’s QRD (Quick Reference Data sheet).
2. Calculate the amount of additional refrigerant needed for the line set length of the actual installation. This information is
on the first page of the unit’s QRD (Quick Reference Data sheet).
3. Weigh in the additional charge amounts determined by step 1 and 2 above.
4. Return to the system when the outdoor temperature is 65 degrees F or higher and follow the steps defined in step 4 of
the “If the outdoor temperature is 65 degrees F or higher” section above.

9
Figure 5. Wiring Diagram for *SA(1,2)BD4M1SN (1.5, 2, 2.5, 3, 3.5, 4, & 5 Ton Units)
Single Phase
1. Couper le courant avant de faire letretien.
2. Employez uniquement des conducteurs en cuivre.
3. Ne convient pas aux installations de plus de 150 volt a la terre.
710388B
(Replaces 710388A)
0109
WIRING DIAGRAM
Split System Air Conditioner (Outdoor Section)
NOTES:
1. Disconnect all power before servicing.
2. For supply connections use copper conductors only.
3. Not suitable on systems that exceed 150 volts to ground.
4. For replacement wires use conductors suitable for 105 deg C.
5. For ampacities and overcurrent protection, see unit rating plate.
6. Connect to 24 vac/40ca/class 2 circuit. See furnace/airhandler installation
instructions for control circuit and optional relay/transformer kits.
7. Anti-Short Cycle Timer (ASCT) may or may not be installed in the unit. If desired,
ASCT is factory installed on select models only or may be field installed as shown using
manufacturer’s approved kit. If not present, connect Yellow and Black wires per Note 6.
FIELD WIRING
LEGEND:
LOW VOLTAGE
HIGH VOLTAGE¢710388B¤
CC - Contactor Coil
CCH - Crankcase Heater
HPS - High Pressure Switch
208/230V
CC
ASCT
ASCT
(SEE NOTE 7)
H
C
F
CCH
(OPTIONAL)
R
C
S
S
C
R
L2
T2
COMPRESSOR
CONTACTS
L1
T1
COMPRESSOR
OUTDOOR FAN
MOTOR
24 VOLT FIELD
CONNECTIONS HPS
HPS
T2
T1
T3
ASCT
(SEE
NOTE 7)
GROUNDING
SCREW
L1 L2 GND
T1 T2
L1 L2
OUTDOOR
FAN MOTOR
C
S
DUAL
CAPACITOR
R
3
1
2
START
CAPAC
START
RELAY
BLACK
BLUE
ORANGE
YELLOW
CONTACTOR
YELLOW
BLACK
RED
CRANKCASE
HEATER
(OPTIONAL)
YELLOW BLACK
SEE NOTE 6
RED OR
YELLOW
BLACK
RED OR
RED BLACK
BLACK OR
BLK WHT
C
S
R
YELLOW
OR
YELLOW
BLACK
RED OR
RED BLACK
H
C
F
ELECTRICAL DIAGRAMS & TABLES

10
7110050
WIRING DIAGRAM
NOTES:
FIELD WIRING
LEGEND:
LOW VOLTA GE
HIGH VOLTA GE
CRANKCASE
HEATER
(OPTIONAL)
3
1
2
START
CAPAC
to”C” on
capacitor
to T2 on
capacitor
to “H” on
capacitor
START
RELAY
Single Phase
1. Couper le courant avant de faire letretien.
2. Employez uniquement des conducteurs
en cuivre.
3. Ne convient pas aux installations
de plus de 150 volt a la terre.
Split System Air Conditioner(Outdoor Section)
1. Disconnect all power before servicing.
2. For supply connections use copper conductors only.
3. Not suitable on systems that exceed 150 volts to ground.
4. For replacement wires use conductors suitable for 105 deg C.
5. For ampacities and overcurrent protection, see unit rating plate..
6. Connect to 24 vac/40ca/class 2 circuit. See furnace/airhandler installation
instructions for control circuit and optional relay/transformer kits.
7. Anti-Shor t CycleTi mer (ASCT)may or may not be installed in the unit. If desired,
ASCT is factory installed on select models only or may be field installed as shown using
manufacturer’s approved kit. If not present, connect Yellow and Black wires per Note 6.
8. DO NOT use a Hard Start Kit on a model with a PTCR installed.
CC - Contac tor Coil
CCH - Crankcase Heater
HPS - High Pressure Switch
208/230V
CC
ASCT
ASCT
(SEE NOTE 7)
H
C
F
CCH
(OPTIONAL)
R
C
S
S
C
R
L2
T2
COMPRESSOR
CONTACTS
L1
T1
PTCR(If equipped)
CO MPRESSOR
OUTDOOR FAN
MOTOR
24VOLT FIELD
CONNECTIONS HPS
T1
T3
T2
HPS
WIRE NUT
GROUNDING
SCREW
L1 L2 GND
T1 T2
L1 L2
OUTDOOR
FAN MOTOR
C
S
DUAL
CAPACITOR
R
CONTACTOR
C
S
R
H
C
F
ORANGE
BLUE
BLACK
PTCR
BLACK
BLACK
YELLOW/
BLACK
BLACK
RED
BLACK
YELLOW
BLACK
SEE NOTE6
ASCT
(SEE NOTE 7)
YELLOW
YELLOW
RED
BLACK
YELLOW
Figure 6. Wiring Diagram for *SA(1,2)BD4M1RN (1.5, 2, 2.5, & 3 Ton Units)

11
Table 1. Comfort Alert LED Diagnostics
Status LED Status LED Description Status LED Troubleshooting Information
POWER
(Green LED) Module has power Supply voltage is present at module terminals
TRIP
(Red LED)
Thermostat demand signal Y
is present, but compressor is
not running
• Compressor protector is open
• Check for high head pressure
• Check compressor supply voltage
• Outdoor unit power disconnect is open
• Compressor circuit breaker or fuse(s) is open
• Broken wire or connector is not making contact
• Low pressure switch open if present in system
• Compressor contactor has failed open
ALERT
Flash Code 1
(Yellow LED)
Long Run Time
Compressor is running
extremely long run cycles
• Low refrigerant charge
• Evaporator blower is not running
—Check blower relay coil and contacts
—Check blower motor capacitor
—Check blower motor for failure or blockage
—Check evaporator blower wiring and connectors
—Check indoor blower control board
—Check thermostat wiring for open circuit
• Evaporator coil is frozen
—Check for low suction pressure
—Check for excessively low thermostat setting
—Check evaporator airflow (coil blockages or return airfilter)
—Check ductwork or registers for blockage
• Faulty metering device
—Check TXV bulb installation (size, location and contact)
—Check if TXV/fixed orifice is stuck closed or defective
• Condenser coil is dirty
• Liquid line restriction (filter drier blocked if present in system)
• Thermostat is malfunctioning
—Solenoid plug not connected
—Y2 not wired at Comfort Alert
—Check thermostat sub-base or wiring for short circuit
—Check thermostat installation (location, level)
• Comfort Alert failure
ALERT
Flash Code 2
(Yellow LED)
System Pressure Trip
• High head pressure
—Check high pressure switch if present in system
—Check if system is overcharged with refrigerant
—Check for non-condensable in system
Discharge or suction • Condenser coil poor air circulation (dirty, blocked, damaged)
Pressure out of limits
• Condenser fan is not running
—Check fan capacitor
—Check fan wiring and connectors
—Check fan motor for failure or blockage
Compressor overloaded • Return air duct has substantial leakage
• If low pressure switch present in system, check Flash Code 1 information
ALERT
Flash Code 3
(Yellow LED)
Short Cycling / Compressor is
running only briefly
• Thermostat demand signal is intermittent
• Low line voltage (contact utility if voltage at disconnect is low)
• Excessive liquid refrigerant in compressor
• Compressor bearings are seized
ALERT
Flash Code 4
(Yellow LED)
Locked Rotor
• Run capacitor has failed
• Low line voltage (contact utitlity if voltage at disconnect is low)
• Check wiring connections
• Excessive liquid refrigerant in compressor
• Compressor bearings are seized
• Measure compressor oil level
ALERT
Flash Code 5
(Yellow LED)
Open Circuit
• Outdoor unit power disconnect is open
• Compressor circuit breaker or fuse(s) is open
• Compressor contactor has failed open
—Check compressor contactor wiring and connectors
—Check for compressor contactor failure (burned, pitted or open)
—Check wiring and connectors between supply and compressor
—Check for low pilot voltage at compressor contactor coil
—High pressure switch is open and requires manual reset
• Open circuit in compressor supply wiring or connections
• Unusually long compressor protector reset time due to extreme ambient temperature
• Compressor windings are damaged
—Check compressor motor winding resistance

12
Table 10. LED Diagnostics - Continued
Status LED Status LED Description Status LED Troubleshooting Information
ALERT
Flash Code 6
(Yellow LED)
Open Start Circuit
Current only in run circuit
• Run capacitor has failed
• Open circuit in compressor start wiring or connections
—Check wiring and connectors between supply and the compressor Sterminal
• Compressor start winding is damaged
—Check compressor motor winding resistance
ALERT
Flash Code 7
(Yellow LED)
Open run circuit
Current only in start circuit
• Open circuit in compressor run wiring or connections
—Check wiring and connectors between supply and the compressor Rterminal
• Compressor run winding is damaged
—Check compressor motor winding resistance
ALERT
Flash Code 8
(Yellow LED)
Welded Contactor
Compressor always runs
• Compressor contactor has failed closed
• Thermostat demand signal not connected to module
ALERT
Flash Code 9
(Yellow LED)
Low Voltage
Control circuit < 17VAC
• Control circuit transformer is overloaded
• Low line voltage (contact utility if voltage at disconnect is low)
• Check wiring connections
* Flash code number corresponds to a number of LED flashes, followed by a pause and then repeated. Trip and alert LED’s
flashing at same time means control circuit voltage is too low for operation.
Table 2. Module Wiring Troubleshooting
Miswired Module Indication Recommended Troubleshooting Action
Green LED is not on, module does not power up • Determine if both R& Cmodule terminals are connected.
• Verify voltage is present at module’s R& Cterminals.
Green LED intermittent, module powers up only when compressor
runs
• Determine if R& Yterminals are wired in reverse.
• Verify modules R & C terminals have a constant source.
Trip LED is on, but system and compressor check OK
• Verify Yterminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
• Verify 24VAC is present across Y& Cwhen thermostat demand signal is preset. If not,
R& Care reversed wired.
TRIP LED & ALERT LED flashing together • Verify R& Cterminals are supplied with 19 - 28VAC.
ALERT Flash CODE 3 displayed incorrectly
(Compressor short cycling)
• Verify Yterminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 5, 6, or 7 displayed incorrectly
(Open Circuit, Open Start Circuit or Open Run Circuit)
• Verify the compressor run and start wires are routed through the module’s current
sensing holes.
• Verify the Yterminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 6 (Open Start Circuit) displayed for Code 7
(Open Run Circuit) or vice-versa
• Verify the compressor run and start wires are routed through the correct module sensing
holes.
ALERT Flash Code 8 displayed incorrectly (Welded Contactor)
• Determine if module’s Yterminal is connected.
• Verify Yterminal is connected to 24VAC at contactor coil.
• Verify 24VAC is present across Y& Cwhen thermostat demand signal is present. If
not, R& Care reversed wired.
• Verify voltage at contactor coil falls below 0.5VAC when off.
• Review Thermostat Demand Wiring (page 10) for Y& Cwiring.

13

14

15

INSTALLATION CHECKLIST
INSTALLATION ADDRESS:
CITY: STATE:
UNIT MODEL #:
UNIT SERIAL #:
INSTALLER NAME:
CITY: STATE:
Unit Installed Minimum clearances per
Figure 1 (page) 3?YES NO
Has the owner’s information been
reviewed with the customer? YES NO
Has the Literature Package been left
with the unit? YES NO
REFRIGERATION SYSTEM
Was unit given 24 hr warm up period
for crankcase heaters? YES NO
Stage-1 Liquid Pressure (high side):
Stage-1 Suction Pressure (low side):
Specifications & illustrations subject to change without notice or incurring obligations (09/22).
O’Fallon, MO, © Nortek Global HVAC LLC 2022. All Rights Reserved.
REPLACEMENT PARTS
Replacement parts are available through your distributor.
Please have the complete model and serial number of the
unit when ordering replacement parts.
ELECTRICAL:
Capacitors Temperature Limit Switches
Compressors Thermostats
Contactors Time Delay Relays
Pressure Switches Transformers
Relays
MOTORS:
Blower Motor
Fan Motor
COMPONENTS:
Blower Assembly Fan Grille
Cabinet Panels Filter/Driers
Expansion Valves
10348150
(Replaces 10252440)
ELECTRICAL SYSTEM
Electrical connections tight? YES NO
Line voltage polarity correct? YES NO
Rated Voltage:
Has the thermostat been calibrated? YES NO
Is the thermostat level? YES NO
Is the heat anticipator setting correct?
(If Applicable) YES NO